public function testAcsOK()
{
$auth = m::mock('OneLogin_Saml2_Auth');
$saml2 = new Saml2Auth($auth);
$auth->shouldReceive('processResponse')->once();
$auth->shouldReceive('getErrors')->once()->andReturn(null);
$auth->shouldReceive('isAuthenticated')->once()->andReturn(true);
$error = $saml2->acs();
$this->assertEmpty($error);
}